| 摘要 |
PURPOSE: A manufacturing method of a bisphenol A novolac epoxy resin is provided to provide a bisphenol A novolac epoxy resin having excellent physical properties like heat resistance, etc and improved workability by reducing a content of materials with low molecular weight and simplifying processes. CONSTITUTION: A manufacturing method of a bisphenol A novolac epoxy resin comprises: a step of preparing a bisphenol A novolac resin solution by mixing bisphenol A novolac epoxy resin with alcohol solvent, and leaving the solution alone; a step of separating the bisphenol A novolac epoxy resin solution in an upper part, and mixing alcohol solvent to the bisphenol A novolac epoxy resin solution in a lower part again, and leaving the solution alone; and a step of separating the bisphenol A novolac epoxy resin in the upper part, and extracting the bisphenol A novolac epoxy resin solution in the lower part.
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